diff --git a/tests/ImageSharp.Tests/Processing/Transforms/ProjectiveTransformTests.cs b/tests/ImageSharp.Tests/Processing/Transforms/ProjectiveTransformTests.cs
index a34b024c7..c7b49fb92 100644
--- a/tests/ImageSharp.Tests/Processing/Transforms/ProjectiveTransformTests.cs
+++ b/tests/ImageSharp.Tests/Processing/Transforms/ProjectiveTransformTests.cs
@@ -49,9 +49,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
                 image.Mutate(i => { i.Transform(m, sampler); });
 
                 image.DebugSave(provider, resamplerName);
-
-                // TODO: Enable and add more tests.
-                // image.CompareToReferenceOutput(ValidatorComparer, provider, resamplerName);
+                image.CompareToReferenceOutput(ValidatorComparer, provider, resamplerName);
             }
         }
 
@@ -70,9 +68,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
                 image.Mutate(i => { i.Transform(m); });
 
                 image.DebugSave(provider);
-
-                // TODO: Enable and add more tests.
-                // image.CompareToReferenceOutput(ValidatorComparer, provider, resamplerName);
+                image.CompareToReferenceOutput(ValidatorComparer, provider);
             }
         }
 
diff --git a/tests/Images/External b/tests/Images/External
index f1c585d0b..81d1fce94 160000
--- a/tests/Images/External
+++ b/tests/Images/External
@@ -1 +1 @@
-Subproject commit f1c585d0b931504d33ae2741ede72c0bf5ae5cb7
+Subproject commit 81d1fce944960efa3bd9d2cda4f7657a40c6be39